Thread take-up for sewing-machines.



No. 865,234 I PATENTED SEPT. 3, 1907.

W. BUSGHBR.

THREAD TAKE-UP FOR SEWING MACHINES.

' APPLIOATIOI PILBD APR. 13. 1908.

3 SHEETS-SHEET 1.

rns NORIUS PETERS cm. WASHINGTON, o. c.

No. 865,234; PATENTED SEPT. 3, 1907. w. BUSOHER.

THREAD TAKE-UP FOR SEWING MACHINES.

APPLICATION-FILED APR. 1a. 1906.

3 SHEETS-SHEET 2.

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PATEN'I'ED SEPT. a, 1907; w. BUSOHERY THREAD TAKE-UP FOR SEWINGMACHINES. APPLIUATION FILED APB.13. 1906.

3 SHEETS-SHEET 3.

UNITED sTArns PATENT OFFICE.

WILHELM BUSOI-IER, OF BIELEFELD, GERMANY, ASSIGNOR TO THE FIRM OF ANKER-WERKE AKTIEN-GESELLSGHAFT VORMALS HENGSTENBERG & 00., OF BIELEFELDGERMANY.

THREAD TAKE-UP FOR SEWING-MACHINES.

Specification of Letters Patent.

Application filed April 13,1906- Serial No- 311,459.

Patented Sept. 3, 1907.

invented certain new and useful Improvements in Thread Take-Ups forSewing-Machines, of which the following is a specification, referencebeing had to the accompanying drawings, forming a part thereof.

Rotating thread take-up devices for sewing ma chines, as usuallyarranged heretofore, are mounted to rotate upon fixed axes at varyingspeed, so as to take up the slack of the thread and to give slack asrequired. The radius of the take-up, however, is necessarily somewhatlimited and the length of thread which can be taken up is thereforelimited correspondingly. It has been sought in some instances toovercome this difiiculty and to make it possible to take up a greaterlength of thread by providing two cooperating take-up devices, but suchan arrangement is found too complicated in practice.

In accordance with the present invention the takeup has not only itsusual rotary movement, but it re- .ceives in addition a movement ofbodily translation, preferably in a vertical direction. For convenience,the movement of translation is secured by mounting the rotary take-upupon the vertically reciprocating needle-bar.

The invention will be more fully described herein after with referenceto the accompanying drawings in which, for purposes of explanation ofthe nature of the invention, it is illustrated as embodied in a suitablestructure.

In the drawings, Figure 1 is a view in front elevation of so,much of asewing machine as is necessary to enable the application of theinvention to be understood, the rotating take-up being represented bydotted lines in order that other parts behind the same may be shown moreclearly; Figs. 2, 3 and 4 are views similar to Fig. 1, but illustratingthe parts in different successive positions; Fig. 5 is a view in sideelevation of the parts shown in Fig. 1, a portion of the frame beingshown in section and the looper being omitted. Fig. 6 is a diagrammaticview illustrating the real path of the take-up pin and the circular pathwhich it would follow if the take-up arm revolved on a fixed shaft. 1

In the embodiment of the invention represented in the drawings theneedle-bar a is reciprocated vertically in the usual manner by a crank con the driving shaft 6 and a link d. The rotating take-up 8, also ofusual construction, is mounted so as to have a movement of bodilytranslation, its shaft f being, in the present instance, journaled in abearing block 9 on the needle-bar, so that it moves up and downtherewith. For the purpose of rotating the take-up 2 during its up anddown movement with the needlebar, an opposite crank h is fixed tothe pinof the crank c and at its end is connected by an intermediate link iwith a crank it on the shaft f of the take-up, so that an irregularrotary motion is communicated to the take-up pin n of the take-up aduring the up and down movement of the take-up and the pin 11. describesa path represented by the dotted line in in Fig. 1. If the rotarymovement .of the pin were regular the path m would be a symmetricalellipsoidal curve, but by reason of the irrcgular rotation, the curve mhas a somewhat irregular form as indicated.

When the needle-bar a is in its highest position, as indicated in Fig.1, the-bearing of the shaft f is momentarily at a standstill and as therotation of the take-up continues the pin it at that moment moves in thearc of a circle. The looper p at this moment stands in such a positionthat the threaddoop s has passed its lowest position and is about to bedrawn off. After a quarter rotation of the driving shaft 1) the partsassume the positions represented in Fig. 2, in which the take-up pin itreaches the position marked 2 on the curve m in Fig. 1. During themovement to this position the loop 8 is quickly drawn off from thelooper p and contracts and the thread then slackens with the continueddescent of the needle, as it moves downward to make the stitch. Duringthe next quarter rotation of the shaft b the take-up pin n advances tothe point marked 3 on the path at in Fig. 1 and the thread is furtherslackened slightly. In this position the needle penetrates the fabricand reaches its lowest position. At the beginning of the next quarterrotation of the shaft 1) the looper p seizes the loop s as it isformedby the upward movement of the needle. The thread is slackened atfirst slowly and thereafter rapidly during the upward movement of theneedlebar. At the end of this quarter rotation of the shaft 1; thetake-up pin n reaches the point marked 4 of the path m in Fig. 1 andduring this movement the loop 8 is drawn completely around the looper pand the thread is at first relaxed relatively somewhat further by theaction of the take-up and thereafter the stretch-- ing of the threadbegins, while the needle-bar returns to its highest position. At the endof this quarter rotation the take-up pin it again reaches its initialposition, marked 1 on the path in in Fig. 1.

As indicated by the distribution of the points 1, 2, 3 and 4 on the pathm, the movement of the take-up pin it is quite irregular. It has itsgreatest speed from the point 1 to the point 2, that is, during thetaking up of the thread, which may take place at high speed as thethread loop 8 is then liberated from the looper. The formation oftheloop also takes place at a rather high speed, as indicated by thedistance from the point 3 to the point 4, the thread being then rapidlyslackened. During the interval of time between the contraction of onethread loop and the formation of the next loop, the take-up pin n hasits slowest speed, its movement being then from the point 2 to the point3.

In order to illustrate the effect of the up and down movement of theshaft of the thread take-up with the needle bar upon the relaxing of thethread, the curve m (Fig. 6) isillustrated in connection with a circle mwhich the thread take-up pin would describe, if the thread lever turnedabout a stationary axis, the position otwhich would correspond to theposition shown in Fig. 1. To the points 1, 2, 3 and 4 of the curve mcorrespond the points 1, 2, 3 and 4 of the circle m, and it is seendirectly that difference of the length of thread taken up by the take-uppin is greater between 2 and 4 than between 2 and 4. Therefore thethread lever ascending and descending with the needle bar relaxes thethread during the loop formation more and, besides, more rapidly than athread take-up with stationary axle.

It will be obvious that various changes in details of construction andarrangement can be made without departing from the spirit of theinvention, in accordance with which the take-up has a movement of bodilytranslation as well as a movement of rotation.

I claim as my invention:

1. A rotating take-up for sewing machines, a reciprocating part uponwhich the rotating takeup is mounted and means to rotate the take-upduring its reciprocation.

2. In a sewing machine, a reciprocating part, a rotating take-up havingits shaft mounted on said reciprocating part, a'crank shaft, andconnections between the crank shaft and the takeup to rotate the sameduring its reciprocation.

3. In a sewing machine, a needle-bar, a rotating take-up mounted on theneedle-bar, a crank shaft, and connections between the crank shaft andthe take-up to rotate the latter during its reciprocation.

4. In a sewing machine, a reciprocating needle-bar, a crank shaft,connections between the crank shaft and the needlebar to reciprocate thelatter, a shaft mounted in a hearing on the needle-bar, a take-upcarried by said shaft, a crank arm on said shaft, and link connectionbetween the latter and the crank shaft.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

WILHELM siiscrrnn.

Witnesses OTTO DUKER, Orro AL'IENBERG.

